Last edited 09 Dec 2020

Thermal element

The Building Regulations define thermal elements as:

...a wall, floor or roof (but does not include windows, doors, roof windows or roof-lights) which separates a thermally conditioned part of the building (“the conditioned space”) from— (a) the external environment (including the ground); or

(b) in the case of floors and walls, another part of the building which is—

(i) unconditioned;

(ii) an extension falling within class 7 of Schedule 2; (a conservatory, porch, covered yard or covered way; or carport open on at least two sides) or

(iii) where this paragraph applies, conditioned to a different temperature,

and includes all parts of the element between the surface bounding the conditioned space and the external environment or other part of the building as the case may be.

NB Manual to the Building Regulations, A code of practice for use in England, published by the Ministry of Housing, Communities and Local Government (MHCLG) in July 2020, defines a thermal element as: ‘a material that contributes to the thermal performance of a building’s thermal envelope, such as any element of a wall, floor or roof but not a door or window. Thermal element is defined in Regulation 2(3) of the Building Regulations.’

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